Cove handjob..which size for me?

Hi all..is here anybody who can help me?..I Think I would like to buy a C.Handjob frame but dont know which size is best for me..I am 5,75 (173 cm) tall.I would like to get the 15,5 size because I like compact frames and also because it has not (as I tried to figure out from some pics) bottlecage bosses on the seat tube,so I can slide the seat all way down.Do you think that this size is too little?..By the way I like low frames since dont have long legs..I would you use it for all day trail use.
Can you confilrm me that the green frame is the 15,5 and the black one the 17,5?(the black one seems to have the bottle bosses..the green no).
Thanks for any imputs.cheers

The 15.5" frame has a top tube measurement of 22.50" and the 17.5 is 23".

I think the 17.5" would probably be a little long for you. I am about 176 cm, with shortish legs, and ride a 22.8" long Banshee Scirocco: it fits me well with a stem of around 10 cm (I have a 110mm stem on now but will soon try 90 mm to see if it feels more balanced).